Add a gold-specific patch when gold is used as linker, as only libtool 2.2.7 and later actually report it properly. Check two parents directories for configure as sometimes it would otherwise fail (libarchive), and make the debug log a bit more useful by appending rather than replacing and adding the name of the patch/file it gets tested on.

Change ELT-patches for AIX to use import files as soname-emulator (bug#213277).
This requires switching libtool to force -no-undefined behaviour on AIX.
Additionally, get_libname() now does return .so and versions like Linux.

Import patch from Debian http://bugs.debian.org/347650 which hacks around libtool deplib re-ordering, which inhibits -Wl,--as-needed. You have to set -Wl,--as-needed seperately in LDFLAGS for this to do any good, -Wl,--as-needed,--something-else will not do, but you can set -Wl,--something-else afterwards. Also make sure eclasses I 'own' run elibtoolize so they can reap the benefit.

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